var pi = 3.1415926535897932384626
var a = 6378245.0
var ee = 0.00669342162296594323
var x_pi = (pi * 3000.0) / 180.0
var R = 6378137
//坐标转换
/**百度转84*/
export const bd09_To_gps84 = (lng, lat) => {
	var gcj02 = bd09_To_gcj02(lng, lat)
	var map84 = gcj02_To_gps84(gcj02.lng, gcj02.lat)
	return map84
}
/**84转百度*/
export const gps84_To_bd09 = (lng, lat) => {
	var gcj02 = gps84_To_gcj02(lng, lat)
	var bd09 = gcj02_To_bd09(gcj02.lng, gcj02.lat)
	return bd09
}
/**84转火星*/
export const gps84_To_gcj02 = (lng, lat) => {
	var dLat = transformLat(lng - 105.0, lat - 35.0)
	var dLng = transformLng(lng - 105.0, lat - 35.0)
	var radLat = (lat / 180.0) * pi
	var magic = Math.sin(radLat)
	magic = 1 - ee * magic * magic
	var sqrtMagic = Math.sqrt(magic)
	dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * pi)
	dLng = (dLng * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi)
	var mgLat = lat + dLat
	var mgLng = lng + dLng
	var newCoord = {
		lng: mgLng,
		lat: mgLat
	}
	return newCoord
}
/**火星转84*/
export const gcj02_To_gps84 = (lng, lat) => {
	var coord = transform(lng, lat)
	var lontitude = lng * 2 - coord.lng
	var latitude = lat * 2 - coord.lat
	var newCoord = {
		lng: lontitude,
		lat: latitude
	}
	return newCoord
}
/**火星转百度*/
export const gcj02_To_bd09 = (x, y) => {
	var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi)
	var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi)
	var bd_lng = z * Math.cos(theta) + 0.0065
	var bd_lat = z * Math.sin(theta) + 0.006
	var newCoord = {
		lng: bd_lng,
		lat: bd_lat
	}
	return newCoord
}
/**百度转火星*/
export const bd09_To_gcj02 = (bd_lng, bd_lat) => {
	var x = bd_lng - 0.0065
	var y = bd_lat - 0.006
	var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi)
	var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi)
	var gg_lng = z * Math.cos(theta)
	var gg_lat = z * Math.sin(theta)
	var newCoord = {
		lng: gg_lng,
		lat: gg_lat
	}
	return newCoord
}

export const transform = (lng, lat) => {
	var dLat = transformLat(lng - 105.0, lat - 35.0)
	var dLng = transformLng(lng - 105.0, lat - 35.0)
	var radLat = (lat / 180.0) * pi
	var magic = Math.sin(radLat)
	magic = 1 - ee * magic * magic
	var sqrtMagic = Math.sqrt(magic)
	dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * pi)
	dLng = (dLng * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * pi)
	var mgLat = lat + dLat
	var mgLng = lng + dLng
	var newCoord = {
		lng: mgLng,
		lat: mgLat
	}
	return newCoord
}

export const transformLat = (x, y) => {
	var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x))
	ret += ((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0) / 3.0
	ret += ((20.0 * Math.sin(y * pi) + 40.0 * Math.sin((y / 3.0) * pi)) * 2.0) / 3.0
	ret += ((160.0 * Math.sin((y / 12.0) * pi) + 320 * Math.sin((y * pi) / 30.0)) * 2.0) / 3.0
	return ret
}

export const transformLng = (x, y) => {
	var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
	ret += ((20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0) / 3.0
	ret += ((20.0 * Math.sin(x * pi) + 40.0 * Math.sin((x / 3.0) * pi)) * 2.0) / 3.0
	ret += ((150.0 * Math.sin((x / 12.0) * pi) + 300.0 * Math.sin((x / 30.0) * pi)) * 2.0) / 3.0
	return ret
}
